.center {
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    display: flex;
    flex-direction: column;
}

.maskBackground {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background-color: #000;
    opacity: 0.9;
    z-index: 1;
}